Car comparison

BMW 6 Series Convertible (F12) 640ivsBMW 2 Series Convertible (F23) 230i

Compare specs, acceleration, fuel consumption, dimensions, practicality, and estimated running costs side by side.

New comparison

BMW 6 Series Convertible (F12)

640i

320 hp2979 ccGasolineAWDAutomaticTurbochargedCabriolet / convertible2013-2015
VS

BMW 2 Series Convertible (F23)

230i

252 hp1998 ccGasolineRWDAutomaticTurbochargedCabriolet / convertible2016-2017

Comparison overview

Use the estimates as comparison hints and verify exact figures before making decisions.

Best choices

BMW 6 Series Convertible (F12) 640i

  • Quickest 0-100 km/h
    5.4 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    320 hp
    239 kW
  • Highest torque
    450 Nm
    332 lb-ft
  • Best power-to-weight
    168 hp/t
    125 kW/t
    6.0 kg/hp
  • Largest trunk
    300 L
  • Best overall score
    59/100
  • Best performance score
    66/100
  • Best practicality score
    45/100

BMW 2 Series Convertible (F23) 230i

  • Lightest
    1,570 kg
    3,461 lb
  • Lowest combined fuel consumption
    6.2 L/100 km
    37.9 mpg US
    45.6 mpg UK
  • Lowest city consumption
    7.8 L/100 km
    30.2 mpg US
    36.2 mpg UK
  • Lowest highway consumption
    5.3 L/100 km
    44.4 mpg US
    53.3 mpg UK
  • Lowest CO2 emissions
    142 g/km
  • Best estimated range
    839 km
    521 mi
  • Best economy score
    90/100

Specification comparison

Specification comparison
ModelBMW6 Series Convertible (F12)640iBMW2 Series Convertible (F23)230i
Power
320hp239kW
252hp188kW
Torque
450Nm332lb-ft
350Nm258lb-ft
Curb weight
1,910kg4,211lb
1,570kg3,461lb
Gross weight
2,400kg5,291lb
2,010kg4,431lb
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
80.0s99% target: 257 km/h / 160 mph
Calculated
87.0s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
5.4s
5.9s
0-200 km/h
20.3s
Calculated
22.1s
Calculated
0-60 mph
5.1s
Calculated
5.6s
Calculated
Fuel consumption
8.4L/100 km28mpg US33.6mpg UK
6.2L/100 km37.9mpg US45.6mpg UK
Fuel consumption city
11.4L/100 km20.6mpg US24.8mpg UK
7.8L/100 km30.2mpg US36.2mpg UK
Fuel consumption highway
6.6L/100 km35.6mpg US42.8mpg UK
5.3L/100 km44.4mpg US53.3mpg UK
Quarter mile
13.6s
Calculated
14.0s
Calculated
Power-to-weight
168hp/t125kW/t76hp/1000 lb
Calculated
161hp/t120kW/t73hp/1000 lb
Calculated
Torque-to-weight
236Nm/t158lb-ft/ton
Calculated
223Nm/t149lb-ft/ton
Calculated
Estimated range
833km518mi
Calculated
839km521mi
Calculated
Displacement
2,979cc182cu in
1,998cc122cu in
Length
4,894mm193in
4,432mm174in
Width
1,894mm75in
1,774mm70in
Height
1,365mm54in
1,413mm56in
Wheelbase
2,855mm112in
2,690mm106in
Front track
1,600mm63in
1,521mm60in
Rear track
1,665mm66in
1,556mm61in
Ground clearance
123mm5in
140mm6in
Trunk volume
300L
280L
Max trunk volume
350L
335L
Doors
2
2
Seats
4
4
Fuel tank
70L
52L
CO2 emissions
195g/km
142g/km

Performance charts

Use the estimates as comparison hints and verify exact figures before making decisions.

Dyno simulation

Estimated stock-style power and torque curves by engine speed.

BMW 6 Series Convertible (F12) 640iBMW 2 Series Convertible (F23) 230iPowerTorque
  • BMW 6 Series Convertible (F12) 640i: Power / Torque
  • BMW 2 Series Convertible (F23) 230i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW6 Series Convertible (F12)640i5,800-6,000 rpm1,300-4,500 rpm6,250 rpm
BMW2 Series Convertible (F23)230i5,200 rpm1,450-4,800 rpm5,450 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW6 Series Convertible (F12)640iBMW2 Series Convertible (F23)230i
Acceleration checkpoints
0-60 mph
0-97 km/h
5.1 s
5.6 s
0-100 km/h
0-62 mph
5.4 s
5.9 s
0-200 km/h
0-124 mph
20.3 s
22.1 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Likely limited
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Likely limited
Drag race simulation
60 ft
18 m
2.2 s
2.3 s
330 ft
101 m
5.8 s
6.1 s
1/8 mile
201 m
8.8 s
9.2 s
1000 ft
305 m
11.4 s
11.8 s
1/4 mile
402 m
13.6 s
14.0 s
Trap speed
1/4 mile
402 m
169 km/h
105 mph
164 km/h
102 mph

Power comparison

Bar comparison chart for Power. Higher is better · hp / kW

Chart data table
VehicleValue
BMW6 Series Convertible (F12)640i
320 hp
239 kW
BMW2 Series Convertible (F23)230i
252 hp
188 kW

BMW 6 Series Convertible (F12) 640i has 68 hp more than BMW 2 Series Convertible (F23) 230i.

The biggest power difference is between BMW 2 Series Convertible (F23) 230i and BMW 6 Series Convertible (F12) 640i: 68 hp (51 kW).

Torque comparison

Bar comparison chart for Torque. Higher is better · Nm / lb-ft

Chart data table
VehicleValue
BMW6 Series Convertible (F12)640i
450 Nm
332 lb-ft
BMW2 Series Convertible (F23)230i
350 Nm
258 lb-ft

Curb weight comparison

Bar comparison chart for Curb weight. Lower is better · kg / lb

Chart data table
VehicleValue
BMW6 Series Convertible (F12)640i
1,910 kg
4,211 lb
BMW2 Series Convertible (F23)230i
1,570 kg
3,461 lb

Top speed without limiter comparison

Bar comparison chart for Top speed without limiter. Higher is better · km/h / mph

Chart data table
VehicleValue
BMW6 Series Convertible (F12)640i
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW2 Series Convertible (F23)230i
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph

0-100 km/h comparison

Bar comparison chart for 0-100 km/h. Lower is better · seconds

Chart data table
VehicleValue
BMW6 Series Convertible (F12)640i5.4 s
BMW2 Series Convertible (F23)230i5.9 s

The biggest 0-100 km/h difference is between BMW 6 Series Convertible (F12) 640i and BMW 2 Series Convertible (F23) 230i: 0.5 s.

Fuel consumption comparison

Bar comparison chart for Fuel consumption. Lower is better · L/100 km / mpg US / mpg UK

Chart data table
VehicleValue
BMW6 Series Convertible (F12)640i
8.4 L/100 km
28.0 mpg US
33.6 mpg UK
BMW2 Series Convertible (F23)230i
6.2 L/100 km
37.9 mpg US
45.6 mpg UK

The biggest fuel consumption difference is between BMW 2 Series Convertible (F23) 230i and BMW 6 Series Convertible (F12) 640i: 2.2 L/100 km.

Power-to-weight comparison

Bar comparison chart for Power-to-weight. Higher is better · hp/t / kW/t

Chart data table
VehicleValue
BMW6 Series Convertible (F12)640i
168 hp/t
125 kW/t
6.0 kg/hp
BMW2 Series Convertible (F23)230i
161 hp/t
120 kW/t
6.2 kg/hp

Estimated range comparison

Bar comparison chart for Estimated range. Higher is better · km / mi

Chart data table
VehicleValue
BMW6 Series Convertible (F12)640i
833 km
518 mi
BMW2 Series Convertible (F23)230i
839 km
521 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW6 Series Convertible (F12)640i
320 hp
239 kW
5.4 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW2 Series Convertible (F23)230i
252 hp
188 kW
5.9 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph

Most attractive quadrant

Scatter chart with performance score on the X axis and practicality score on the Y axis.

Chart data table
VehiclePerformance scorePracticality score
BMW6 Series Convertible (F12)640i
Power
320 hp
239 kW
0-100 km/h5.4 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
300 L
10.6 cu ft
Length
4,894 mm
192.7 in
Height
1,365 mm
53.7 in
BMW2 Series Convertible (F23)230i
Power
252 hp
188 kW
0-100 km/h5.9 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
280 L
9.9 cu ft
Length
4,432 mm
174.5 in
Height
1,413 mm
55.6 in

Performance vs fuel economy

Cars closer to the top-right corner combine stronger performance with better fuel economy scores.

Performance vs fuel economy data table
VehiclePerformance scoreFuel economy score
BMW6 Series Convertible (F12)640i
Power
320 hp
239 kW
0-100 km/h5.4 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
8.4 L/100 km
28.0 mpg US
33.6 mpg UK
BMW2 Series Convertible (F23)230i
Power
252 hp
188 kW
0-100 km/h5.9 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
6.2 L/100 km
37.9 mpg US
45.6 mpg UK

BMW 6 Series Convertible (F12) 640i is closest to the top-right balance target for performance and fuel economy.

Acceleration vs fuel consumption

Cars closer to the lower-left corner offer a better mix of quick acceleration and low fuel consumption.

Acceleration vs fuel consumption data table
VehicleFuel consumption, L/100 km0-100 km/h, s
BMW6 Series Convertible (F12)640i
8.4 L/100 km
28.0 mpg US
33.6 mpg UK
5.4 s
BMW2 Series Convertible (F23)230i
6.2 L/100 km
37.9 mpg US
45.6 mpg UK
5.9 s

Power-to-weight vs fuel consumption

The shaded area favors higher power-to-weight with lower combined fuel consumption.

Power-to-weight vs fuel consumption data table
VehiclePower-to-weight, hp/tFuel consumption, L/100 km
BMW6 Series Convertible (F12)640i
168 hp/t
125 kW/t
6.0 kg/hp
8.4 L/100 km
28.0 mpg US
33.6 mpg UK
BMW2 Series Convertible (F23)230i
161 hp/t
120 kW/t
6.2 kg/hp
6.2 L/100 km
37.9 mpg US
45.6 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW6 Series Convertible (F12)640iBMW2 Series Convertible (F23)230i
Power
320 hp
239 kW
252 hp
188 kW
Torque
450 Nm
332 lb-ft
350 Nm
258 lb-ft
Acceleration
5.4 s
5.9 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
1,910 kg
4,211 lb
1,570 kg
3,461 lb
Fuel consumption
8.4 L/100 km
28.0 mpg US
33.6 mpg UK
6.2 L/100 km
37.9 mpg US
45.6 mpg UK
Practicality
Doors/seats
2 doors
4 seats
Trunk
300 L
10.6 cu ft
Length
4,894 mm
192.7 in
Height
1,365 mm
53.7 in
Doors/seats
2 doors
4 seats
Trunk
280 L
9.9 cu ft
Length
4,432 mm
174.5 in
Height
1,413 mm
55.6 in
Range score
833 km
518 mi
839 km
521 mi
CO2 score
195 g/km
142 g/km
Trunk score
300 L
10.6 cu ft
280 L
9.9 cu ft
Power-to-weight score
168 hp/t
125 kW/t
6.0 kg/hp
161 hp/t
120 kW/t
6.2 kg/hp
Overall
Fixed score
Fixed score

Fuel cost and annual usage

Estimate running costs from combined consumption, your annual distance, and the fuel price in your local currency.

Enter the fuel price in your local currency, for example €/L, $/gal, £/L or any other local currency.

LC = Local Currency

Fuel cost and annual usage
VehicleBMW 6 Series Convertible (F12) 640iBMW 2 Series Convertible (F23) 230i
Consumption8.4 L/100 km28 mpg US33.6 mpg UK6.2 L/100 km37.9 mpg US45.6 mpg UK
Cost / 100 km14.70 LC100 km10.85 LC100 km
Cost / 100 mi23.66 LC100 mi17.46 LC100 mi
Annual fuel used1,260 L333 US gal277 UK gal930 L246 US gal205 UK gal
Annual fuel cost2,205 LC/year1,628 LC/year

Head-to-head comparisons

BMW 6 Series Convertible (F12) 640i

  • Has 68 hp more
  • Has 100 Nm more
  • Is 0.5 s quicker from 0-100 km/h
  • Has 7 hp/t better power-to-weight
  • Has 20 L more trunk volume

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Most powerful
  • Highest torque
  • Best power-to-weight ratio
  • Largest trunk

Cons

  • Highest combined fuel consumption
  • Heaviest
  • Highest CO2 emissions

BMW 2 Series Convertible (F23) 230i

  • Is 340 kg lighter
  • Uses 2.2 L/100 km less fuel
  • Has 5 km (3 mi) more estimated range
  • Emits 53 g/km less CO2

Pros

  • Lightest
  • Lowest combined fuel consumption
  • Best estimated range

Cons

  • Slowest 0-100 km/h
  • Lowest power
  • Smallest trunk

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 6 Series Convertible (F12) 640i
BMW 2 Series Convertible (F23) 230i
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BMW 6 Series Convertible (F12) 640i vs BMW 2 Series Convertible (F23) 230i - car comparison - FastVsFaster